Absystem and method for echo cancellation

H - Electricity – 04 – M

Patent

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Details

H04M 9/00 (2006.01)

Patent

CA 2390059

A line card (22) for coupling a subscriber line (18) to a switching network (17) the line card (22) comprising an echo canceling circuit (42) for reducing an echo signal received from the network and perceived at a user instrument coupled to the subscriber line. The network cancellation circuit utilizes a network model (44) to predict an echo replica signal which is then subtracted either from the transmit (47) or receive (49) signals to the network. The line card (22) may include a far end echo cancellation circuit, a near end echo cancellation circuit or a combination of both.

L'invention concerne une carte de ligne (22) permettant de coupler une ligne d'abonné (18) à un réseau de commutation (17), la carte de ligne (22) comprenant un circuit d'annulation d'écho (42) destiné à réduire un signal d'écho reçu du réseau et perçu au niveau d'un instrument d'utilisateur couplé à la ligne d'abonné. Le circuit d'annulation du réseau utilise un modèle (44) de réseau pour prédire un signal de réplique d'écho lequel est ensuite soustrait soit du signal de transmission (47) soit du signal de réception (49) sur le réseau. La carte de ligne (22) peut contenir un circuit d'annulation d'écho à l'extrémité distante, un circuit d'annulation d'écho à l'extrémité proche ou une combinaison des deux.

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